javascript-basics/validation.html at main · DEMiHAT/javascript-basics · GitHub

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<!DOCTYPE html>
<html>
<head>
    <title>Form Validation</title>
</head>
<body>
<h2>Form Validation Example</h2>

<form onsubmit="return validateForm()">
    <label>Name:</label>
    <input type="text" id="name"><br><br>

    <label>Email:</label>
    <input type="text" id="email"><br><br>

    <label>Password:</label>
    <input type="password" id="password"><br><br>

    <button type="submit">Submit</button>
</form>

<h3 id="result" style="color:red;"></h3>

<script>
    function validateForm() {
        let name = document.getElementById("name").value.trim();
        let email = document.getElementById("email").value.trim();
        let password = document.getElementById("password").value.trim();
        let result = document.getElementById("result");

        // Check for empty fields
        if (name === "" || email === "" || password === "") {
            result.innerHTML = "⚠️ All fields are required!";
            return false;
        }

        // Validate email format
        let emailPattern = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;
        if (!emailPattern.test(email)) {
            result.innerHTML = "❌ Invalid email format!";
            return false;
        }

        // Check password length
        if (password.length < 6) {
            result.innerHTML = "🔒 Password must be at least 6 characters long!";
            return false;
        }

        // If all checks pass
        result.style.color = "green";
        result.innerHTML = "✅ Form submitted successfully!";
        return true;
    }
</script>
</body>
</html>